#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    string x;
    cin >> x;
    sort(x.begin(), x.end(), greater<>());
    string x2 = x;
    prev_permutation(x2.begin(), x2.end());
    if (x2[0] == '0' || x == x2) {
        cout << -1 << endl;
    } else {
        cout << x2 << endl;
    }
    return 0;
}